I think it has always used Verdana for text and Courier for input & code. http://web.archive.org/web/20070405032412/http://news.ycombi... What does your browser render it as? (Right-click -> Inspect Element, click "Computed" at the top of the right-hand pane.)
Edit: oh, now it's "Verdana, Geneva, sans-serif" where it used to be "Verdana, sans-serif". So if you have Geneva but not Verdana, and Geneva was not already your sans-serif font, it will look different.
Edit: oh, now it's "Verdana, Geneva, sans-serif" where it used to be "Verdana, sans-serif". So if you have Geneva but not Verdana, and Geneva was not already your sans-serif font, it will look different.